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C++ Iterator Library - input_iterator_tag
Description
It is used to identify the category of an iterator as an input iterator and all input iterators support at least one the following operations.
C++98
property | valid expressions |
---|---|
It is a copy-constructible, copy-assignable and destructible |
b = a; |
It can be compared for equivalence using the equality/inequality operators (meaningful if both iterators are be in domain). |
a != b |
It can be dereferenced as an rvalue (if in a dereferenceable state). |
a->m |
It can be incremented (if in a dereferenceable state). The result is either also dereferenceable or a past-the-end iterator. The previous iterator value is not required to be dereferenceable after the increase. |
(void)a++ *a++ |
Its value type does not need to be assignable | t = u not required |
C++11
property | valid expressions |
---|---|
It is a copy-constructible, copy-assignable and destructible |
b = a; |
It can be compared for equivalence using the equality/inequality operators (meaningful if both iterators are be in domain). |
a != b |
It can be dereferenced as an rvalue (if in a dereferenceable state). |
a->m |
It can be incremented (if in a dereferenceable state). The result is either also dereferenceable or a past-the-end iterator. The previous iterator value is not required to be dereferenceable after the increase. |
(void)a++ *a++ |
Its value type does not need to be assignable | t = u not required |
Lvalues are swappable. | swap(a,b) |
Declaration
Following is the declaration for std::input_iterator_tag.
C++11
struct input_iterator_tag {};